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1. The Earth cools off a night more quickly when the weather is clear than when it is cloudy, why?
2. Describe why the temperature of a gas increase when it is adiabatically compressed.
3. Which will give the greater improvement in the efficiency of a Carnot engine, a 10 degrees C increase in the high -temperature reservoir, or a 10 degrees C decrease in the low- temperature reservoir?
a spherical shell of radius r carries a uniform charge q. what is the potential at the center of the
A playground swing at its highest point during a child's play is 3.0 meters above the ground, Determine the torque exerted by gravity on a child on the swing when the swing is at the highest point of its motion
A playground is on the flat roof of a city school, 5 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, Find the speed at which the ball was launched
A student sitting on a frictionless rotating stool has rotational inertia 0.90kg?m2 about a vertical axis through her center of mass when her arms are tight to her chest. Ignoring her arm mass, what's her new rotational velocity
a crate is pulled 2.0 m at constant velocity along a 15 degree incline. the coefficient of kinetic friction between the
a spacecraft is in orbit around a planet. the radius of the orbit is 3.1 times the radius of the planet which is r
Unpolarized light passes through two polaroid sheets. The axisof the first is vertical, and that of the second is at 25.0° to the vertical. What fraction of the initial light is transmitted
A cubical box .2 m on a side is completely immersed in a fluid. The pressure at the top of the box is 105 kPA, What is the denstiy of the fluid
A gymnast with mass m1 = 40 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 110 kg and length L = 5 m. Each support is 1/3 of the way from each end. at first the gymnast stands at the left end of..
At high altitudes, water boils at a temperature lower than 100.0° C due to the lower air pressure. What activation energy does this rule imply for the chemical reactions
a hoop of mass M=2 kg and radius R=0.4 m rolls without slipping down a hill. what is the speed Vfinal at the bottom of the hill
a small lead ball attached to a 1.6-m rope is being whirled in a circle that lies in the vertical plane. the ball is
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